Based on the entropy-free thermodynamic approach, a generalized theory of thermodynamic systems with internal variables of state is being developed. For the case of nonlinear thermodynamic systems with internal variables of state and linear relaxation, the necessary and sufficient conditions have been proved for fulfillment of the second law of thermodynamics in entropy-free formulation which, according to the basic theorem of the theory, are also necessary and sufficient for the existence of a thermodynamic potential. Moreover, relations of correspondence between thermodynamic systems with memory and systems with internal variables of state have been established, as well as some useful relations in the spaces of states of both types of systems.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 91, No. 1, pp. 5–21, January–February, 2018.
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Shnip, A.I. The Theory of Thermodynamic Systems with Internal Variables of State: Necessary and Sufficient Conditions for Compliance with the Second Law of Thermodynamics. J Eng Phys Thermophy 91, 1–15 (2018). https://doi.org/10.1007/s10891-018-1714-2
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DOI: https://doi.org/10.1007/s10891-018-1714-2